Figure: 30 TAC §117.105(b)(6)
Where:
EL2 = time-weighted NOX emission limitation for each 30-day period, in lb/MMBtu of heat input;
EL1 = appropriate NOX emission specification for gas-fired boilers from paragraph (1)(A) -
(F) of this subsection or gas-fired process heaters from paragraph (2)(A) and (B) of
this section, in lb/MMBtu of heat input;
1.25 = factor used as a multiplier times the appropriate emission limitation when firing
gaseous fuel that contains more than 50% hydrogen by volume, over an eight-hour
period;
T1 = time in hours when firing gaseous fuel that contains more than 50% hydrogen by
volume, over an eight-hour period during each 30-day period. The time period when
hydrogen rich fuel is combusted must, at a minimum, be a consecutive eight-hour
period to be used in the determination of T1; and
T2 = time in hours when firing gaseous fuel or hydrogen rich fuel (for less than eight
consecutive hours) during each 30-day period.